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<?php echo preg_match('/Я/ui', 'я'); echo preg_match('/(?=Я)/ui', 'я'); echo preg_match('/Л/ui', 'л'); echo preg_match('/(?=Л)/ui', 'л');
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Op0GK
function name:  (null)
number of ops:  21
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'preg_match'
         1        SEND_VAL                                                 '%2F%D0%AF%2Fui'
         2        SEND_VAL                                                 '%D1%8F'
         3        DO_ICALL                                         $0      
         4        ASSIGN_OBJ                                               $0
   4     5        INIT_FCALL                                               'preg_match'
         6        SEND_VAL                                                 '%2F%28%3F%3D%D0%AF%29%2Fui'
         7        SEND_VAL                                                 '%D1%8F'
         8        DO_ICALL                                         $1      
         9        ASSIGN_OBJ                                               $1
   5    10        INIT_FCALL                                               'preg_match'
        11        SEND_VAL                                                 '%2F%D0%9B%2Fui'
        12        SEND_VAL                                                 '%D0%BB'
        13        DO_ICALL                                         $2      
        14        ASSIGN_OBJ                                               $2
   6    15        INIT_FCALL                                               'preg_match'
        16        SEND_VAL                                                 '%2F%28%3F%3D%D0%9B%29%2Fui'
        17        SEND_VAL                                                 '%D0%BB'
        18        DO_ICALL                                         $3      
        19        ASSIGN_OBJ                                               $3
        20      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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